ISO Diameter: 559 / 26" mtn Butyl rubber Wall Thickess: .9 mm Presta Valve Presta Shaft Type: Threaded Valve length listed in millimeters Valve Core: Removable Weight: 170g. (26x1.9-2.125" 32mm valve), 202g. (26x2.1-2.3" 32mm valve) NOTE: Q-Tubes is re-branding as Teravail, while the quality product remains the same. Stock is mixed, and some tubes will be branded Q-Tubes and some will be branded Teravail